<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .box1{
            width: 500px;
            height: 500px;
            border: 1px solid rebeccapurple;
            margin: 200px;
            position: relative;
        }

        .box2{
            width: 100px;
            height: 100px;
            background-color: red;
            position: absolute;
            left: 0;
            bottom: 0;
        }
    </style>
</head>
<body>
    <div class="box1">
        <div class="box2"></div>
    </div>
</body>
</html>
